The economy most definitely experiences stability when people and business are able to have a reasonable amount of confidence that things don't hit the fan at any second now. This stability allows people to invest with more freedom, take more risk, and grow at a stable rate.

Of course this behavior eventually overheats...but in terms of expectations there is definitely a stable state to an economy, even if it only last a few years.

>The economy is never "stable". It is constantly in a cycle of ups and downs, over-investment and under-investment, easy money and tight money...

That's pedantic and beside the point. The question is whether the economy experiences periods of relative stability. The answer is yes.

What's the difference between stability and growth? If the economy isn't growing, people consider it "stagnant". Shrinking is "a recession".

Zero is a special value you know, since zero times anything is zero.

Edit: Except infinity ...

In the limit 0*x tends to zero as x tends to infinity.

An infinite amount of nothing is still nothing.

According to my limited understanding it is NaN.